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Addition of erythrocytes to in vitro culture medium attenuates the detrimental effects of reactive oxygen species on bovine preimplantation embryo development

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ABSTRACT

Erythrocytes were recently found to improve the early development of mice embryos by their antioxidant effect. The purpose of the present study was to examine the effect of erythrocytes on the in vitro development of bovine in vitro fertilized (IVF) embryos in medium supplemented with reactive oxygen species (ROS). IVF embryos were cultured in CR1aa medium supplemented with oxidizing agents, 0.5 mmol/L hypoxanthine and 0.01 U/mL xanthine oxidase (HX/XOD), in the presence and absence of erythrocytes (5 × 104, 5 × 105, 5 × 106 and 5 × 107 erythrocytes/mL). After 8 days, blastocysts were examined with a stereomicroscope. HX/XOD blocked development to the blastocyst stage (HX/XOD: 0%, control: 33%), but in the presence of both erythrocytes and HX/XOD, blastocyst development was restored to about one‐third to two‐thirds the normal rate (5 × 105 to 5 × 107 erythrocytes/mL: 12 to 23%). Furthermore, adding erythrocytes or erythrocyte hemolysate to medium without HX/XOD increased the blastocyst rate. These results suggest that the addition of erythrocytes can attenuate the detrimental effects of ROS on embryo development in bovine species as well as in mice.
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Document Type: Research Article

Affiliations: Zen-noh Embryo Transfer Center, Kamishihoro, Hokkaido, Japan

Publication date: January 1, 2012

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